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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Nov. 30, 2021
Nov. 30, 2020
Commitments And Contingencies [Line Items]        
Liabilities $ 298,740   $ 307,502 $ 271,301
Lindsay, Nebraska Facility [Member]        
Commitments And Contingencies [Line Items]        
Current environmental remediation accrual     16,100  
Liabilities $ 11,000 $ 11,000    
Liabilities discounted risk Free interest rate 1.20% 1.20%    
Discounted portion of liabilities     $ 12,400